1. The aim of the present study was to evaluate the influence of fluvastatin (3-hydroxy-3-methylglutarylcoenzyme A reductase inhibitor) on heterotopic ossification (HO) induced by HeLa cells. 2. C57Bl/6 mice were injected with 3 x 10(6) HeLa cells into right thigh muscles. Mice in the experimental group received fluvastatin 1.2 mg/kg per day for 17 consecutive days, while mice in the control group received placebo. Intact mice served as an additional control. Seventeen days post-HeLa cell grafting, blood samples were collected to measure total serum cholesterol (TC), triglycerides (TG), low density lipoprotein cholesterol and alkaline phosphatase (AP). 3. In all animals injected with HeLa cells, the mass of mineral deposited in the induced ossicle was established after hydrolysis of soft tissues surrounding the induced ossicles. In fluvastatin-treated mice, the mass of mineral deposited in heterotopically induced ossicles was significantly increased, when compared to mice receiving placebo. This was followed by a significant decrease of TG concentration; whereas the levels of serum AP were not significantly affected. 4. These results indicate that administration of statins may affect heterotopic ossification. This may also have clinical implication, because patients predisposed to HO and receiving statins during hypocholesterolemic treatment, may be at even greater risk of HO.